Remove the flashlight and battery from the package. Make sure that the negative
polarity side of the battery is facing the head of flashlight. install the
battery and screw the tail cap on tightly.

Turn ON/OFF: single click the side switch. When you turn on the light, the
output level will return to the last output mode (except strobe mode).

Changing brightness level: With the light on, press and hold the side switch.
the output will cycle through low, medium, and high brightness levels. Release
the side switch when the desired brightness level is achieved.

Moon light mode: when the light is off, click and hold the side switch for 1
second and the moon light mode will activate. If the light is turned off while
on moon light mode, single clicking the side switch will automatically return
the light to moon light mode.
How to activate the high brightness output when the light is off: quickly double
click the side switch.

Strobe mode: triple-click the side switch to activate strobe mode. Click the
side switch once to quit strobe mode.

Timer: The S1 contains two timer settings: long timer (10 minutes) and short
timer (3 minutes). Double click the side switch to enter this setting. short
timer blink for 3 minutes, long time blink for 10 minutes. Double click the side
switch to change the timer to the opposite setting. After the setting is saved,
the light will blink 3 times and then will enter the timer mode. The light will
automatically shut off when the timer is over.